kmemleak not found in BBB

Dear beagle,

I am using beaglebone black with 3.8 kernel. I enabled CONFIG_DEBUG_KMEMLEAK(To debug a module) in kernel but i couldn’t find /sys/kernel/debug/kmemleak. But another entries in debug folder are available only kmemleak is missing.

I am using yocto project to build my filesystem and I am mounting my filesystem by NFS.

Am i missing something?